Pulley-casing.



UNITED STATES PATENT OFFICE;

EDVIN BRADSHAW, OF BUFFALO, NEW YORK, ASSIGNOR TO MARGARET BRADSHAW, OF BUFFALO, NEW YORK.

PU LLEY-CASING.

SPECIFICATION forming part of Letters Patent N 0. 687,516, dated November 26, 1901- Application filed March 11, 1901. Serial No. 50,682. (No model.)

To all whom it may concern:

Be it known that I, EDWIN BRADSHAW, a citizen of the United States, and a resident of Buffalo, in vthe county of Erie and State of New York, have invented a new and useful Improvement in Pulley-Casings, of which the following is a specification.

This invention relates to pulley blocks or casings which are provided with a clutch device for clamping the cord or rope passing around it, so as to prevent rotation of the pulley and retain the cord in any desired position.

My improved clutch device is designed more especially for the sash-pulleys of windows in which the sash or sashes are capable of a swinging or pivotal movement, rendering it necessary to detach the sash cord or chain therefrom before swinging the sash into the room. When my clutch is used with such a sash, it serves to prevent the sashweight from raisin gthe sash-cord beyond convenient reach.

The object of my invention is to provide pulley blocks or casings with a simple clutch device of this character which does not materially increase the cost of the fixture and which while securely gripping the sash-cord does not interfere with its ordinary movements.

In the accompanying drawings, Figure 1 is a fragmentary perspective view of a window provided with my improved clutch. Fig. 2 is a fragmentary central section of the sashpulley and the window-frame, taken at right angles to the pulley-axle. Fig. 3 is a face view of the same,showing the sash-cord pulled laterally for clutching it. Fig. 4 is a horizontal section in line 4 4, Fig. 3. Fig. 5 is a detached perspective view of the clutch-bar. Fig. 6 is a vertical section similar to Fig. 2, showing a modified construction of the clutch. Fig. 7 is a face View of said modified pulleycasing.

Like letters of reference refer to like parts in the several figures.

A is the body of a sashpulley casing,seated in a mortise in the window-frame in the usual manner, and A is its face-plate, which is secured to the window-frame by the customary upper and lower screws (1 a.

B is the grooved sash-pulley, and O the corresponding sash-cord, which may be detachably secured to the sash D by any suitable or well-known means.

Referring to the construction shown in Figs. 1 to 5, E is a clutch-bar secured vertically to the window-frame and the face-plate A of the pulley-casing above the sash-pulley and provided at its lower end with a clutch tongue or lip E, which extends downwardly a short distance below the top of the pulley and which is located centrally on the casing opposite the groove of the pulley. This clutchtongue is arranged substantially tangentially to the pulley and located at a sufficient distance from its edge to clear the sash-cord when the latter runs normally in the groove of the pulley; but the tongue is at the same time located in such close proximity to the flanges of the pulley as to form upwardlytapering spacesf between the edges of said flanges and the rear side of the tongue. The lower portions of these spaces are somewhat wider than the diameter of the sash cord or chain, while their upper portions are narrower than the same, so that upon detaching the cord from the sash and deflecting or pullingit laterally, as shown by full lines in Fig. 3, and then releasing it the sash-Weight by turning the pulley rearwardly draws the cord upwardly between the converging faces of the clutch-tongue and the opposing pulley-flange, as shown in Fig. 4;, thereby pinching the cord between these faces, holding the pulley against turning, and keeping the detached end of the cord in convenient reach ready to be reattached to the sash. To release the cord, it is only necessary to pull the same and return it to its normal position in line with the pulley-groove.

The clutch-tongue E is preferably tapered or narrowed toward its lower end and curved forwardly, as shown, to facilitate the deflection of the cord and its entrance between the tongue and the pulley-flanges. In the construction shown the tongue is provided in its rear side with a vertical groove 9 to insure ample clearance between the tongue and the sash-cord in the normal position of the latter. By constructing and arranging the clutchtongue E as shown the sashcord can be clutched by a comparatively small deflection thereof, and it can be gripped from either side of the pulley, thus enabling the pulley casing to be used either right orleft or on either side of the window-frame.

The clutch-bar E may be secured in place by any suitable means; but it is preferably fastened at its upper end by a screw e entering the window-frame and near its lower end by the upper screw a of the pulley-casing, as shown. The height of the screw (1 varies in difierent pulley-casings, and to meet this condition the clutch-bar E is provided with a vertical slot 6 for the passage of said screw. In addition to these fastenings the clutch-bar is preferably provided near its lower end with rearwardly-extending lugs h, which project into the slot of the face-plate A and bear against the edges of the same, thereby effectnally holding the bar against-lateral displacement.

In the construction shown in Figs. 1 to 5 the clutch-tongue E and the bar E form a separate attachment applicable to any ordinary sash pulley casing. If desired, the clutch-tongue may he termed in one piece with the pulley-casing, as shown at E in Figs. 6 and 7. In this case the construction and function of the tongue is in all respects like that of the first-described construction.

To prevent cutting of the sash-cord, the edges of the pulley-flanges are preferably rounded, as shown.

The clutch-bar E is somewhat narrower than the usual sash-grooves in the stiles of the sash, so as to allow the bar to enter the adjacent groove of the sash when the top of the sash rises above the sash-pulley, thus permitting the sash to be raised to its uppermost position without interfering with the clutchbar.

I claim as my invention-- 1. The combination with a pulley-casing and a pulley journaled therein, of a clutchtongue arranged on the casing opposite the groove of the .pulley and tangentially to the pulley, said tongue clearing the cord running around the pulley when the cord is in its normal position, and the clutch-tongue having its inner portion separated from the opposing pulleyfiange or flanges by a space of less width than the diameter of the cord, substantially as set forth.

2. The combination with a pulley-casing and a pulley jonrnaledtherein, of a clutchtongue arranged centrally on the face-plate of the casing opposite the groove of the pulley and tangentially to the pulley, said tongue being arranged to clear the cord running around the pulley, when the cord is in its normal position, and the tongue being located in such close proximity to the pulley-flanges as to form tapering clutch-spaces between the tongue and said flanges, substantially as set forth.

3. The combination with the pulley-casing and the pulley journaled therein, of a separate clutch-bar arranged on the face of the casing and having a longitudinal slot for the passage of a fastening-screw, and a clutchtongue located at the lower end of said bar and extending downwardly on the front side of the pulley and arranged tangentially thereto, sald tongue having its inner portion separated from the opposing pulley-flanges by a space of less width than the diameter of the cord running around the pulley, substantially as set forth. I

4. The combination with a pulley-casing and a pulley journaled therein, of a clutchtongue arranged centrally on the face-plate of the casing opposite the groove of the pulley and tangentially to the latter, and provided opposite the pulley-groove with a vertical groove, said tongue having its inner portion separated from the opposing pulleyflanges by a space of less width than the diameter of the cord running over the pulley, substantially as set forth.

Witness my hand this 7th day of March, 1901.

' EDWIN BRADSHAW- Witnesses:

CARL F. GEYER, THEO. L. POPP. 

